They represent 1.6% of the population, today. Religion isn't the same thing as race. If a Jew marries a non-Jew, neither turns into someone else. The non-Jew may choose to convert, and some or all of the kids will likely be Jewish.
Russia: U.S. plan to provide air cover for Syrian rebels undermines Damascus fight on ISIS (Reuters)
from the article: Why Jewish communities in Europe need to step up to the EU challenge